An mvec file extension is related to the Playground SDK and used for its font files.
MVEC file extension - Playground SDK font
What is mvec file? How to open mvec files?
File type specification:
The mvec file extension is associated with the Playground SDK, a video games development tool for Microsoft Windows and Apple Mac OS X (macOS) systems.
The mvec file stores some kind of font used by Playground.
Playground SDK seems to be obsolete product.
This mvec file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.